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denis-greek [22]
3 years ago
12

When did most of the major groups of animals first appear during the paleozoic era?

Biology
1 answer:
Gnom [1K]3 years ago
6 0
Most major animal groups first appeared during the Cambrian Period (544 to 505 million years ago) during the Paleozoic era. 
During the Cambrian period hard shelled animals appeared in great numbers for the first time, significantly because shallow seas flooded the continents. It is truly an astonishing period in evolution of life on earth. Most major groups of animals first appear in the fossil record, an event popularly and scientifically called the Cambrian Explosion. 
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How many years would it take the Atlantic Ocean to grow 500 centimeters? Show your work.
dlinn [17]

Answer:

250 years

Explanation:

The Atlantic Ocean is not static, but instead it is very active, and it is actually spreading from its central part. In its central part, this ocean has a mid-ocean ridge. This basically means that there is constant formation of new crust from the magma that comes out, and the old crust is pushed sideways as the new one is formed. On an annual level, the mid-ocean ridge is spreading out by an estimated 0.02 meters, thus that is how much the Atlantic Ocean is spreading out each year. In order to get to the result as to how many years are needed for the Atlantic Ocean to spread 500 cm, we just need to multiply the annual spreading with the number of cm in question:

0.02 x 500 =250

Thus we get a result of 250, meaning that in 250 years the Atlantic Ocean will spread out 500 cm in total.

8 0
3 years ago
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timurjin [86]

Answer:

Explanation:

The correct answer is (B) Helicase creates the replication fork; single-strand binding proteins keep the single strands from reuniting. The replication fork is established by the enzyme DNA helicase, which separates the two complementary strands of a DNA molecule

7 0
3 years ago
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Gametes contain ________ the genetic material that a somatic (body) cell contains.
drek231 [11]
The answer to this question would be: half of

Gametes cell is a haploid cell that only has half of genetic material from the parent cells. The process of making gamete cells is called meiosis.
The gamete is haploid because it was used in fertilization and need to fuse with other gametes(example: sperm with the egg) resulting in a full paired chromosomes.
7 0
4 years ago
explain what DNA is and how the model of DNA developed .You should include information on how genetic information is carried ,as
jolli1 [7]

Answer:

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Explanation:

I kow this because if you close you see two strands

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